参考答案

正确答案：C
解析：词义题型见第四段第二句：Thejudge also questioned the size of the class，as well as the claim that as many as 90 percent of light cigarette smokers chose the cigarettes because they were less harmful．(法官也对这一类人的数量表示怀疑，正如索赔所说，有多达90％的吸淡烟的人选择淡烟是因为淡烟不那么有害)；之前一句提到法官对原告的理论表示怀疑，这句说法官对the size of the class也有怀疑，两者并列；应是指文章第一句中提到的共同起诉(class action)的人即上句中的the plaintiffs。因此C为答案。